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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, Plant and Equipment
Following is a summary of property, plant and equipment:
 
December 31,
2017
 
December 31,
2016
Land
$
385,027

 
288,633

Buildings and improvements
1,413,877

 
1,189,408

Machinery and equipment
4,603,911

 
3,979,349

Furniture and fixtures
211,730

 
236,183

Leasehold improvements
78,803

 
77,976

Construction in progress
792,936

 
472,226

 
7,486,284

 
6,243,775

Less accumulated depreciation and amortization
3,215,494

 
2,873,427

Net property, plant and equipment
$
4,270,790

 
3,370,348


Additions to property, plant and equipment included capitalized interest of $8,543, $5,608 and $7,091 in 2017, 2016 and 2015, respectively. Depreciation expense was $408,646, $366,233 and $328,486 for 2017, 2016 and 2015, respectively. Included in the property, plant and equipment are capital leases with a cost of $5,984 and $7,986 and accumulated depreciation of $2,071 and $4,436 as of December 31, 2017 and 2016, respectively.